scholarly journals The NUADU experiment on TC-2 and the first Energetic Neutral Atom (ENA) images recorded by this instrument

2005 ◽  
Vol 23 (8) ◽  
pp. 2825-2849 ◽  
Author(s):  
S. McKenna-Lawlor ◽  
L. Li ◽  
S. Barabash ◽  
K. Kudela ◽  
J. Balaz ◽  
...  
Keyword(s):  
Neutral Atom ◽  
Ring Current ◽  
Global Scale ◽  
Measurement Range ◽  
Spatial Evolution ◽  
Energetic Neutral Atom ◽  
Temporal And Spatial ◽  
Low Altitude ◽  
Northern And Southern Hemispheres ◽  
South Polar

Abstract. The Earth’s ring current and how it responds to varying interplanetary conditions is described and an account provided of the production of Energetic Neutral Atoms (ENAs) in the geo-corona. Also, the potential to remotely monitor, on a global scale, the temporal and spatial evolution of magnetospheric plasma populations through analysing ENA images recorded during magnetic storms/substorms is indicated. A technical account of the Energetic NeUtral Atom Detector Unit NUADU aboard China’s TC-2 mission (measurement range 45–>158 keV) follows, together with an account of the scientific objectives of NUADU, both in stand-alone mode and in the context of multi-point imaging. Low altitude ENA emissions recorded by NUADU during south polar passages of TC-2 at the time of a moderate magnetic storm in September 2004, as well as bright ring current emissions recorded in November 2004 during a major geomagnetic storm, are presented and discussed in the context of various, accompanying, terrestrial disturbances. Also, ENA observations of the November 2004 ring current imaged simultaneously by TC-2/NUADU and by IMAGE/ HENA (viewing, respectively, from the Northern and Southern Hemispheres), are compared.

scholarly journals TWINS energetic neutral atom observations of local-time-dependent ring current anisotropy

2012 ◽  
Vol 117 (A11) ◽  
pp. n/a-n/a ◽  
Author(s):  
J. Goldstein ◽  
P. Valek ◽  
D. J. McComas ◽  
J. Redfern
Keyword(s):  
Local Time ◽  
Neutral Atom ◽  
Ring Current ◽  
Time Dependent ◽  
Energetic Neutral Atom

Laser-Enhanced Ionization Flame Velocimeter

1982 ◽  
Vol 36 (2) ◽  
pp. 168-171 ◽  
Author(s):  
P. K. Schenck ◽  
J. C. Travis ◽  
G. C. Turk ◽  
T. C. O'Haver
Keyword(s):  
Laminar Flow ◽  
Low Power ◽  
Flow Velocity ◽  
Neutral Atom ◽  
Seed Density ◽  
Spatial Evolution ◽  
Atom Density ◽  
Low Sodium ◽  
Temporal And Spatial ◽  
Better Than

The temporal and spatial evolution of the depleted neutral atom density following laser-enhanced ionization in laminar flow flames has been used to characterize the flow velocity of the flame gases. This technique utilizes a low power cw dye laser and a low sodium seed density (1011 to 1012 atoms/ml). The flow velocity can be measured to better than 2% in standard analytical burners.

scholarly journals Time evolution of high-altitude plasma bubbles imaged at geomagnetic conjugate points

2004 ◽  
Vol 22 (9) ◽  
pp. 3137-3143 ◽  
Author(s):  
K. Shiokawa ◽  
Y. Otsuka ◽  
T. Ogawa ◽  
P. Wilkinson
Keyword(s):  
High Altitude ◽  
Conjugate Points ◽  
Spatial Evolution ◽  
Magnetic Latitude ◽  
Plasma Bubbles ◽  
Scale Size ◽  
Upward Velocity ◽  
Temporal And Spatial ◽  
Apex Height ◽  
Northern And Southern Hemispheres

Abstract. Temporal and spatial evolution of two high-altitude plasma bubbles (evening and midnight) was observed on 4 April 2002, at geomagnetic conjugate points at Sata, Japan (magnetic latitude 24° N), and Darwin, Australia (magnetic latitude 22° S), using two 630-nm airglow imagers. The apex height of the bubbles reached ~1500km. The upward velocity of the evolution was faster in the evening (~170m/s at 20:00-21:00 LT) than around midnight (~28m/s at 23:00-00:00 LT). Bifurcating features of the bubbles into a smaller scale size of ~50km were clearly seen for both the evening and midnight bubbles, showing fairly good conjugacy between the Northern and Southern Hemispheres.

scholarly journals IMAGE/high-energy energetic neutral atom: Global energetic neutral atom imaging of the plasma sheet and ring current during substorms

2002 ◽  
Vol 107 (A12) ◽  
pp. SMP 21-1-SMP 21-13 ◽  
Author(s):  
P. Cson Brandt ◽  
R. Demajistre ◽  
E. C. Roelof ◽  
S. Ohtani ◽  
D. G. Mitchell ◽  
...  
Keyword(s):  
Plasma Sheet ◽  
Neutral Atom ◽  
Ring Current ◽  
High Energy ◽  
Energetic Neutral Atom

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

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